CWB makes the "Clutch" which is a rubber handle. Andrew Adkinson supposedly still uses it.

I'm doing the same thing this year-eva just doesn't last as long. One is actually in the mail for me from my local CWB dealer, but I had to special order it. Performance Ski and Surf also has them, but you have to call them.

the endure team handle by accurate is a 15" wakeboard handle with the classic black rubber grip. my shop has some of those. when we got them in i thought they were ski handles but they are actually wakeboard handles, with the t grip and all that jazz.

I have the original Clutch by Proline and love it. It is rounded over on the tractor part so it does not tear your hands up, yet gives tons of grip. So far I have not found any gimmick that works better. To me foam is not something a handle should be made out of. I have never seen one last, and I have to hang on with more than just my finger tips, which is how I hold the handle.